<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片试图区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary"
                     @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table :data="cateList"
                  :columns="columns"
                  :selection-type="false"
                  :expand-type="false"
                  show-index
                  index-text="#"
                  border
                  :show-row-hover="false"
                  class="treeTable">
        <!-- 是否有效列 -->
        <template slot="isok"
                  slot-scope="scope">
          <i class="el-icon-success"
             v-if="scope.row.cat_deleted === false"
             style="color:lightgreen"></i>
          <i class="el-icon-error"
             v-else
             style="color:red"></i>
        </template>
        <!-- 排序列 -->
        <template slot="order"
                  slot-scope="scope">
          <el-tag size="mini"
                  v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag type="success"
                  size="mini"
                  v-else-if="scope.row.cat_level === 1">二级</el-tag>
          <el-tag type="warning"
                  size="mini"
                  v-else>三级</el-tag>
        </template>
        <!-- 操作列 -->
        <template slot="opt"
                  slot-scope="scope">
          <el-button type="primary"
                     icon="el-icon-edit"
                     size="mini"
                     @click="showEditCateDialog(scope.row.cat_id)">编辑</el-button>
          <el-button type="danger"
                     icon="el-icon-delete"
                     size="mini"
                     @click="removeCate(scope.row.cat_id)">删除</el-button>

        </template>
      </tree-table>
      <!-- 分页区域 -->
      <el-pagination @size-change="handleSizeChange"
                     @current-change="handleCurrentChange"
                     :current-page="queryInfo.pagenum"
                     :page-sizes="[3, 5, 10, 15]"
                     :page-size="queryInfo.pagesize"
                     layout="total, sizes, prev, pager, next, jumper"
                     :total="total"></el-pagination>
    </el-card>
    <!-- 添加分类对话框 -->
    <el-dialog title="添加分类"
               :visible.sync="addCateDialogVisible"
               width="50%"
               @close="addCateDialogClose">
      <!-- //添加分类的表单 -->
      <el-form :model="addCateForm"
               :rules="addCateFormRules"
               ref="addCateFormRef"
               label-width="100px">
        <el-form-item label="分类名称："
                      prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <!-- 级联选择器 -->
          <!-- options 指定数据源； props 指定配置对象 -->
          <el-cascader v-model="selectedKeys"
                       :options="parentCateList"
                       :props="cascaderProps"
                       @change="parentCateChange"
                       clearable></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer"
            class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改分类对话框 -->
    <el-dialog title="修改"
               :visible.sync="editCateDialogVisible"
               width="50%">
      <el-form :model="editCateForm"
               :rules="editCateFormRules"
               ref="editCateFormRef"
               label-width="100px"
               class="demo-ruleForm">
        <el-form-item label="分类名称"
                      prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer"
            class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="eidtCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      //商品分类的数据表 默认为空
      cateList: [],
      //查询条件保存
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //总条数
      total: 0,
      //为table指定列的定义
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        }, {
          label: '是否有效',
          //将当前列定义为模板列
          type: 'template',
          //当前这一列使用模板名称
          template: 'isok'
        }, {
          label: '排序',
          //将当前列定义为模板列
          type: 'template',
          //当前这一列使用模板名称
          template: 'order'
        },
        {
          label: '操作',
          //将当前列定义为模板列
          type: 'template',
          //当前这一列使用模板名称
          template: 'opt'
        },
      ],
      //控制分类对话框的显示与隐藏
      addCateDialogVisible: false,
      //添加分类表单的数据对象
      addCateForm: {
        //将要添加的分类名称
        cat_name: '',
        //父级分类id
        cat_pid: 0,
        //分类层级,默认为1级分类
        cat_level: 0
      },
      //分类表单的验证规则对象
      addCateFormRules: {
        cat_name: [
          {
            required: true, message: '请输入分类名称', trigger: 'blur'
          }
        ],
      },
      //父级分类数据列表
      parentCateList: [],
      //指定级联选择器的配置对象
      cascaderProps: {
        // 配置触发选项 hover/click
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      //选中的父级分类id数组
      selectedKeys: [],
      //控制修改对话框的展示与隐藏
      editCateDialogVisible: false,
      //编辑表单绑定对象
      editCateForm: '',
      //验证修改内容是否合法
      editCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    //获取商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      //把数据列表赋值给cateList
      this.cateList = res.data.result
      //把总数据条数赋值给total
      this.total = res.data.total
    },
    //监听页码显示条数改变事件
    handleSizeChange (newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    //监听当前页码数改变事件
    handleCurrentChange (newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    //点击按钮展示添加按钮的对话框
    showAddCateDialog () {
      //先调取父级分类数据再打开对话框
      this.getParentCateList()
      //打开分类对话框
      this.addCateDialogVisible = true
    },
    //获取父级分类的数据列表
    async getParentCateList () {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类数据失败')
      }
      this.parentCateList = res.data
    },
    //级联选择器选择项发生变化触发这个函数
    parentCateChange () {
      // console.log(this.selectedKeys);
      //如果selectedKeys数组的length大于0，证明选中的父级分类
      if (this.selectedKeys.length > 0) {
        //父级分类的id
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        //为当前分类等级赋值
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        //父级分类的id
        this.addCateForm.cat_pid = 0
        //为当前分类等级赋值
        this.addCateForm.cat_level = 0
      }
    },
    //添加新的分类
    addCate () {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败！')
        }

        this.$message.success('添加分类成功！')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    //关闭添加分类对话框
    addCateDialogClose () {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_id = 0
    },
    //打开修改分类对话框
    async showEditCateDialog (id) {
      const { data: res } = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类失败')
      }
      this.$message.success('获取成功')
      this.editCateForm = res.data
      this.editCateDialogVisible = true
    },
    //根绝id修改分类名
    eidtCate () {
      this.$refs.editCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put('categories/' + this.editCateForm.cat_id, {
          cat_name: this.editCateForm.cat_name
        })
        if (res.meta.status !== 200) {
          return this.$message.error('更新分类名失败')
        }
        this.$message.success('更新分类名成功')
        this.getCateList()
        this.editCateDialogVisible = false
      })
    },
    //根据id删除分类
    async removeCate (id) {
      const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') { return this.$message.info('已取消删除！') }
      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) { return this.$message.error('删除商品分类失败！') }
      this.$message.success('删除商品分类成功！')
      this.getCateList()
    },
  },
}
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>